os:debian testing when uninstall thunar and install nautilus,right click on desktop,press "r",it show `the name org.xfce.FileManager was not provided by any .service files` and when create folder , or document ,it appears same. Only install linthunarx-3-0 & thunar-data wont help,but must install thunar fully,is it that xfcedesktop can not manage some options without thunar?
Yes, xfdesktop optionally depends on Thunar for file management features. It won't work as you tried because xfdesktop calls Thunar interfaces exposed via d-bus which require some .desktop files.